Signal.



NVEIYTOH ATTORNEY.

Patgnted May 22,1912.

UNITED STATES PATENT OFFICE.

WILLIAM SPARKS, OF JACKSON, MICHIGAN, ASSIGNOR TO THE SPARKS-WITHING-TONCOMPANY, OF JACKSON, MICHIGAN, A CORPORATION OF MICHIGAN.

SIGNAL.

Specification of Letters Patent. I Patented Ma y 22,1917.

Application filed October 8, 1915. Serial No. 54,736.

' resident of Jackson, in the county of J ackson, in the State ofMichigan, have invented new and useful Improvements in Signals, ofwhichnthe following, taken in connection with the accompanyingdrawings,is a full, clear, and exact description.v ,v

This invention relates to certain improvementsin mechanicallyoperatedsignals, of the cam-actuated diaphragm type.

The primary object of the invention relates to the production of noveland efficient means for varying the overlap of the cam projections onthe wear-piece of the diaphragm for varying the extent of forced vi--bration ofthe diaphragm and the sound produced therebyJ Other objectsand advantages will appear from the following description, taken inconnection with the accompanying drawing's, in which- Figure 1 is a sideelevation of the device. Fig. 2 is a vertical central cross section ofthe same.

Fig. 3 is a view of the clutch mechanism showing the case in section.

The invention as shown comprises a-suitable diaphragm '1-- having itsmarginal portion clamped between the base -2 of an amplifier 3- and adished case section -lhaving an elongated laterally extending openingarranged substantially centrally of the diaphragm, through which openinga portion. of a rotary actuator- 5-- is adapted to project for allowingcontact of the teeth 6- thereof with a wearpiece rigidly mounted on thediaphragm.

The actuator 5 has a toothed portion 6 positioned substantiallydiametrically of the diaphragm and a second portion 7,- offset from theportion 6- to form a central recess -8-. The offset portion of theactuator 5- is rigidly mounted upon a rotary shaft 9- having a spirallyarranged portion 10- upon which is mounted a suitable actuating andclutch mechanism comprising a case 11 inclosin a nut 12 having a centralopening adapted to fit the shaft 71.0.- so'that longitudinal movement ofthe ut.'-12.- along the shaft 10..will cause rotation of either theshaft or the nut.

The e se ll: is of somewhat gre ter depth that the thickness of the nut12 and is provided with projections 13' for engagement with ratchetteeth l l formed upon the adjacent surface of the nut. As the case ll ismoved downwardly by a suitable hand-operated lever 15- the projections13- are brought into engagement-with the teeth -14 preventing rotationof the nut -1 2, thereby forcing rotation of the shaft 10 and actuator5-. The operating handle 15 is adapted to be returned to startingposition after each operation by a suitable spring 16, and upon thereturn movement of case 11 the'projections 13 are moved out ofengagement with the teeth -l4. allowing the nut 12' to rotate within thecase, thereby allowing the return of the case 11 and nut 12 to startingposition without causing rotation of the shaft 10.

The ends of the shaft -l0 are preferably of substantially conical shapeand one of the same, as 17, is journaled in a suitend 22 of the shaft 10is journaled in a bearing formed upon a bar-23+ positioned within thecase 19- and having .one of its ends, as 24.-'-, flanged upwardly andslotted for the reception of the neck portion 25 of athumb screw 26having a threaded relation with and adjustable through the case -19. Theopposite end of the 23 is provided'with an elongated slot 27- in whichis seated a screw orbolt -28. mounted in the case -l9 and having itsfree end withinthe case provided with a nut -30. and pin -31-.

. The nut 30 may be loosened or tight ened by turning the screw --28-from the outside of the case, and, when'in loosened condition, the bar23 as awhole may be -moved longitudinally of I case -19- by means of setscrew 26, as limited by the slot 27. This. movement of bar 23 moves theend of the shaft 9 toward tuating mechanism, the shaft and actuator,

-in my co-pending application Serial No.

Although I have shown and described one particular structure foraccomplishing the objects of this invention, I do not desire to limitmyself to any particular construction, form or arrangement, as manychanges may be made in the same without departing from the spirit ofthis invention as set forth in the appended claims.-

WVhat I claim is 1. In a signal, a case, a bar Within and extendinglongitudinally of the case, one of said members provided with a slot,the other member carrying a bolt seated in said slot, a shaft having abearing in said bar, and

1 ,227,oea

2. In a signal, a casing, a shaft having bearings Within the casing, oneof said bearings formed in a bar having an elongated slot, a boltengaged with the casing and having a portion extending through saidslot, means adjustable on the bolt for holding the bar in anypredetermined position with respect to the bolt, and means operableeXteriorly of the casing 'and adjustable through the casing for movingsaid bar with respect to said bolt.

In Witness whereof I have hereunto set my hand this 27th day ofSeptember, 1915.

WILLIAM SPARKS. Witnesses:

LILLIAN E. VVUNDERLIGH, N. J CoRBE'r'r.

